NBDE Ultimate 3

Question 1

The biologic width is composed of which two tissue components?

Accepted Answer

Junctional epithelium and supracrestal connective tissue attachment

Answer

The biologic width (~2 mm) consists of the junctional epithelium (~1 mm) and the supracrestal connective tissue attachment (~1 mm) coronal to the alveolar crest.

Question 2

In Andrews' Six Keys to normal occlusion, the mesiobuccal cusp of the maxillary first molar occludes with the:

Accepted Answer

Buccal groove of the mandibular first molar

Answer

The mesiobuccal cusp of the maxillary first molar occludes in the buccal groove of the mandibular first molar in an ideal Class I molar relationship.

Question 3

Which periodontal fiber group runs roughly parallel to the root surface and perpendicular to the long axis of the tooth, connecting cementum to alveolar bone?

Accepted Answer

Alveolar crest fibers

Answer

Alveolar crest fibers run horizontally from the cementum just below the CEJ to the alveolar crest, resisting lateral forces.

Question 4

Alveolar osteitis (dry socket) following tooth extraction is most frequently associated with which site?

Accepted Answer

Mandibular third molars

Answer

Mandibular third molars have the highest incidence of dry socket, estimated at 20-35%, due to poor blood supply, difficult extraction, and fibrinolytic activity in this region.

Question 5

Angle Class II Division 2 malocclusion is characterized by:

Accepted Answer

Retroclined maxillary central incisors with a deep overbite

Answer

Class II Division 2 features a Class II molar relationship with lingually inclined maxillary central incisors, resulting in a deep (excessive) overbite.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Ultimate 3